I've locked differentials on both my Wild Dagger and my TXT-1. For my wild dagger I used rubber bands. For my TXT-1 I used pieces of cotton from an old shirt. However, both differentials are completely closed, unlike the Clod's diffs. JK, the owner of Mudcow, has a very good step-by-step article with photos of how to reliably lock a Clodbuster differential. Here's the URL. http://www.mudcow.com/Page%205.htm